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<p>报告 <a href="https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/beans/factory/annotation/Lookup.html">@Lookup</a> 注解的 <code>value</code> 形参中不正确的 Bean 引用。</p>

<p><b>示例：</b></p>
<pre><code>
  @Component public class FooBean {...}
  @Component public class OtherBean {...}

  @Component public class MyComponent {
  @Lookup("fooBean")
  public FooBean fooBean() {...}

  @Lookup("fooBean") // 报告 "Bean 必须为 'OtherBean' 类型"
  public OtherBean otherBean() {...}

  @Lookup("unknown") // 报告 "无法解析 Bean 'unknown'"
  public OtherBean fooBean() {...}
  }
</code></pre>
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